What is the cheapest airline that flies from Lambert-St Louis to Sofia?

United Airlines and Lufthansa are the most popular carriers operating from Lambert-St Louis to Sofia

When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

The number of operators available for flights from Lambert-St Louis Airport to Sofia Airport is 2 as of November 2025.

How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$375 Cheap Flights from St. Louis to Sofia in 2025/26

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Find the cheapest flights from St. Louis to Sofia

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One-way

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Cheap round-trip flights

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6:42 pm - 10:45 pmSTL-SOF

20h 03m2 stops

1:45 pm - 11:42 pmSOF-STL

17h 57m2 stops

$516Lufthansa

Find Deal

Mon, Dec 8 - Mon, Dec 15

6:40 pm - 6:20 pmSTL-SOF

15h 40m2 stops

6:10 am - 11:59 pmSOF-STL

25h 49m2 stops

$534Lufthansa

Find Deal

Wed, Jan 7 - Wed, Jan 14

11:20 am - 10:45 pmSTL-SOF

27h 25m2 stops

6:00 am - 3:29 pmSOF-STL

41h 29m2 stops

$539United Airlines

Find Deal

Wed, Jan 7 - Tue, Jan 13

3:50 pm - 1:35 pmSTL-SOF

13h 45m1 stop

6:10 am - 11:59 pmSOF-STL

25h 49m2 stops

$542Lufthansa

Find Deal

Fri, Jan 23 - Sun, Feb 1

8:30 am - 10:45 pmSTL-SOF

30h 15m2 stops

6:10 am - 9:13 pmSOF-STL

23h 03m2 stops

$543United Airlines

Find Deal

Wed, Jan 7 - Fri, Jan 16

11:20 am - 10:45 pmSTL-SOF

27h 25m2 stops

6:05 am - 9:13 pmSOF-STL

23h 08m2 stops

$545United Airlines

Find Deal

Thu, Jan 8 - Wed, Jan 14

8:45 am - 10:45 pmSTL-SOF

30h 00m2 stops

6:05 am - 10:58 pmSOF-STL

24h 53m2 stops

$546United Airlines

Find Deal

Thu, Jan 8 - Wed, Jan 14

10:47 am - 1:00 pmSTL-SOF

18h 13m2 stops

12:05 pm - 11:38 pmSOF-STL

43h 33m2 stops

$568British Airways

Find Deal

Sat, Dec 6 - Sat, Dec 13

4:05 pm - 6:20 pmSTL-SOF

19h 15m2 stops

6:10 am - 10:49 pmSOF-STL

23h 39m2 stops

$691Multiple Airlines

Find Deal

Mon, Mar 16 - Fri, Mar 27

4:05 pm - 6:20 pmSTL-SOF

19h 15m2 stops

6:10 am - 2:55 pmSOF-STL

15h 45m1 stop

$747Multiple Airlines

Find Deal

Mon, Mar 16 - Fri, Mar 27

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets

Lufthansa

Dec 8

STL6:42 pmLambert-St Louis

20h 03m

2 stops

SOF10:45 pmSofia

Dec 15

SOF1:45 pmSofia

17h 57m

2 stops

STL11:42 pmLambert-St Louis

$516

Find similar

Lufthansa

Jan 7

STL6:40 pmLambert-St Louis

15h 40m

2 stops

SOF6:20 pmSofia

Jan 14

SOF6:10 amSofia

25h 49m

2 stops

STL11:59 pmLambert-St Louis

$534

Find similar

Lufthansa

Jan 23

STL3:50 pmLambert-St Louis

13h 45m

1 stop

SOF1:35 pmSofia

Feb 1

SOF6:10 amSofia

25h 49m

2 stops

STL11:59 pmLambert-St Louis

$542

Find similar

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets

United Airlines

Jan 7

STL11:20 amLambert-St Louis

27h 25m

2 stops

SOF10:45 pmSofia

Jan 13

SOF6:00 amSofia

41h 29m

2 stops

STL3:29 pmLambert-St Louis

$539

Find similar

United Airlines

Jan 7

STL8:30 amLambert-St Louis

30h 15m

2 stops

SOF10:45 pmSofia

Jan 16

SOF6:10 amSofia

23h 03m

2 stops

STL9:13 pmLambert-St Louis

$543

Find similar

United Airlines

Jan 8

STL11:20 amLambert-St Louis

27h 25m

2 stops

SOF10:45 pmSofia

Jan 14

SOF6:05 amSofia

23h 08m

2 stops

STL9:13 pmLambert-St Louis

$545

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 12/8

6:42 pm-10:45 pm

2 stops20h 03m

Sofia

Mon 12/15

1:45 pm-11:42 pm

2 stops17h 57m

$516

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 1/7

6:40 pm-6:20 pm

2 stops15h 40m

Sofia

Wed 1/14

6:10 am-11:59 pm

2 stops25h 49m

$534

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 1/7

11:20 am-10:45 pm

2 stops27h 25m

Sofia

Tue 1/13

6:00 am-3:29 pm

2 stops41h 29m

$539

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 1/23

3:50 pm-1:35 pm

1 stop13h 45m

Sofia

Sun 2/1

6:10 am-11:59 pm

2 stops25h 49m

$542

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 1/7

8:30 am-10:45 pm

2 stops30h 15m

Sofia

Fri 1/16

6:10 am-9:13 pm

2 stops23h 03m

$543

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 1/8

11:20 am-10:45 pm

2 stops27h 25m

Sofia

Wed 1/14

6:05 am-9:13 pm

2 stops23h 08m

$545

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 1/8

8:45 am-10:45 pm

2 stops30h 00m

Sofia

Wed 1/14

6:05 am-10:58 pm

2 stops24h 53m

$546

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sat 12/6

10:47 am-1:00 pm

2 stops18h 13m

Sofia

Sat 12/13

12:05 pm-11:38 pm

2 stops43h 33m

$568

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 3/16

4:05 pm-6:20 pm

2 stops19h 15m

Sofia

Fri 3/27

6:10 am-10:49 pm

2 stops23h 39m

$691

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 3/16

4:05 pm-6:20 pm

2 stops19h 15m

Sofia

Fri 3/27

6:10 am-2:55 pm

1 stop15h 45m

$747

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Sofia?

According to our data, Saturday is the cheapest day to fly to Sofia from St. Louis. The lowest ticket price found for a Saturday departure recently was $1,095. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from St. Louis to Sofia on a Friday will generally be more expensive and average around $1,306. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the morning is the cheapest time of day to fly from St. Louis to Sofia when you can find flight prices for as low as $1,199. Flying to Sofia in the morning is an ideal time because this is during off-peak travel hours. In the afternoon is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,335 per ticket.

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $937 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $799 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 13% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights	None

There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.

Search flight deals

How far is Lambert-St Louis to Sofia by plane?
A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 13h 45m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?
Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?
The number of operators available for flights from Lambert-St Louis Airport to Sofia Airport is 2 as of November 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to Sofia?
Based on momondo bookings for flights between St. Louis and Sofia, the leading airline is Lufthansa, making up 78% of the total bookings. Other popular airlines include United Airlines with 22%.

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $669	Free Cancellation	Rating 6.8 7,565 reviews		Search Lufthansa flights
United Airlines	PriceFrom $711	Free Cancellation	Rating 7.4 9,012 reviews		Search United Airlines flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from St. Louis to Sofia from $375

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 12/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

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Find the cheapest flights from St. Louis to Sofia

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Cheap last minute flights

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets

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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight to Sofia?

How far in advance should I book a flight to Sofia?

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 13% on your flight if you consider stops on a St. Louis to Sofia flight.

What is the cheapest airline that flies from Lambert-St Louis to Sofia?

United Airlines and Lufthansa are the most popular carriers operating from Lambert-St Louis to Sofia

When to book flights from St. Louis to Sofia

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights

How far is Lambert-St Louis to Sofia by plane?

When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

What documentation or ID do you need to fly to Sofia Airport?

What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

How can momondo help me find flights from St. Louis to Sofia?

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo